Speed ratio control device and control method for automatic transmission
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United States of America Patent
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Dec 5, 2000
Grant Date -
N/A
app pub date -
Sep 22, 1999
filing date -
Sep 25, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A controller (61) calculates a transient target speed ratio based on a final speed ratio set according to a vehicle running condition and second order delay time constant gains (75, S99), and control a speed ratio of a continuously variable transmission to the transient target speed ratio via an actuator (4) (87, S103). The controller (61) also calculates the deviation between the final target speed ratio and transient target speed ratio (74, S95), and determines the second order delay time constant gains based on the deviation (74, S98). Preferably, the gains are determined so that the response rate is slower the larger the deviation (74, S134, S135, S136, S137, S139, S140, S141).
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